J/MNRAS/452/910 IC 1613 asymptotic giant branch variables (Menzies+, 2015)
The Local Group Galaxy IC 1613 and its asymptotic giant branch variables.
Menzies J.W., Whitelock P.A., Feast M.W.
<Mon. Not. R. Astron. Soc., 452, 910-923 (2015)>
=2015MNRAS.452..910M 2015MNRAS.452..910M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Stars, giant
Keywords: stars: AGB and post-AGB - stars: carbon - stars: variables: general -
galaxies: distances and redshifts -
galaxies: individual: IC 1613 - Local Group
Abstract:
JHKs photometry is presented from a 3-yr survey of the
central regions of the Local Group dwarf irregular galaxy IC 1613. The
morphologies of the colour-magnitude and colour-colour diagrams are
discussed with particular reference to the supergiants and M- and
C-type asymptotic giant branch (AGB) stars. Mean JHKs
magnitudes, amplitudes and periods are given for five O-rich and nine
C-rich Mira variables for which bolometric magnitudes are also
estimated. A distance of 750kpc ((m-M)0=24.37±0.08mag) is derived
for IC 1613 by fitting a period-luminosity (PL) relation to the C-rich
Miras. This is in agreement with values from the literature. The AGB
stars exhibit a range of ages. A comparison with theoretical
isochrones suggests that four luminous O-rich Miras are as young as
2x108yr. One of these has a lithium absorption line in its
spectrum, demonstrating that it is undergoing hot bottom burning
(HBB). This supports the idea that HBB is the cause of the high
luminosity of these AGB stars, which puts them above the fundamental
PL relation. Further studies of similar stars, selected from their
positions in the PL diagram, could provide insight into HBB. A much
fainter, presumed O-rich, Mira is similar to those found in Galactic
globular clusters. The C Miras are of intermediate age. The O-rich
variables are not all recognized as O-rich, or even as AGB stars, on
the basis of their J-Ks colour. It is important to appreciate this
when using near-infrared surveys to classify AGB stars in more distant
galaxies.
Description:
We used the Japanese-South African InfraRed Survey Facility (IRSF)
equipped with the SIRIUS camera, which permits simultaneous imaging in
the J, H and KS bands.
We defined four overlapping fields, each approximately 7.8-arcmin2,
with field one centred at RA(2000.0)=01:05:01.3 and
DE(2000.0)=02:11:43.8. Field 2 is 7-arcmin W of field 1, fields 3 and
4 are 7-arcmin south of fields 2 and 1, respectively. Fields 1 and 2
were observed in JHKS at 11 epochs, and the other two at 10 epochs,
over a period of 3yr. Typically 30 dithered exposures of 30s each
were combined at each epoch, though occasionally, depending on sky
brightness at Ks, exposure times were reduced to 20s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 758 *Data for stars with standard errors less than 0.1mag
table2.dat 74 10 Photometry of objects identified as supergiants
in the literature
table3.dat 78 10 Other identifications for the supergiants
table4.dat 70 5 Large-amplitude variables
(O-rich and probable O-rich)
table5.dat 87 5 O-rich variables - other data
table6.dat 86 10 Large-amplitude variables
(C-rich and probable C-rich)
table7.dat 59 9 Other large-amplitude variables
table8.dat 45 18 Red stars from Sibbons et al. (2015, J/A+A/573/A84)
not in the IRSF list, illustrated in Fig. 5
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Note on table1.dat: note that this selection omits the large-amplitude variables
which are listed in Tables 4, 6 and 7 below and G1027, the Cepheid variable.
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See also:
B/gcvs : General Catalogue of Variable Stars (Samus+ 2007-2013)
J/AJ/119/2780 : C stars in IC 1613 (Albert+, 2000)
J/A+A/363/29 : Variable stars in IC 1613 (Antonello+, 2000)
J/AcA/51/221 : OGLE-II. Cepheids in IC 1613 (Udalski+, 2001)
J/A+A/367/759 : Variable stars in IC 1613 (Mantegazza+, 2001)
J/ApJ/712/1259 : LCID project. II. Variables in IC1613 (Bernard+, 2010)
J/A+A/493/1075 : C stars in 2 nearby galaxies JKs photometry (Battinelli+ 2009)
J/A+A/573/A84 : JHK photometry of IC 1613 AGB stars (Sibbons+, 2015)
J/A+A/578/A51 : Near-IR photometry of AGB stars in IC 1613 (Chun+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 F8.5 deg RAdeg Right ascension (J2000)
10- 17 F8.5 deg DEdeg Declination (J2000)
19- 22 I4 --- G Identitication number (this paper)
25- 30 F6.3 mag Jmag J magnitude
32- 36 F5.3 mag e_Jmag rms uncertainty on Jmag
39- 44 F6.3 mag Hmag H magnitude
46- 50 F5.3 mag e_Hmag rms uncertainty on Hmag
53- 58 F6.3 mag Ksmag Ks magnitude
60- 64 F5.3 mag e_Ksmag rms uncertainty on Ksmag
66- 71 F6.3 mag J-H J-H colour index
73- 78 F6.3 mag H-Ks H-Ks colour index
80- 85 F6.3 mag J-Ks J-Ks colour index
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- G Identitication number (this paper)
6- 13 F8.5 deg RAdeg Right ascension (J2000)
15- 22 F8.5 deg DEdeg Declination (J2000)
24- 29 F6.3 mag Jmag J magnitude
31- 36 F6.3 mag Hmag H magnitude
38- 43 F6.3 mag Ksmag Ks magnitude
45- 49 F5.3 mag e_Hmag rms uncertainty on Hmag
51- 55 F5.3 mag e_Jmag rms uncertainty on Jmag
57- 61 F5.3 mag e_Ksmag rms uncertainty on Ksmag
63- 68 F6.3 mag Rmag ? R magnitude
70- 74 F5.3 mag e_Rmag ? rms uncertainty on Rmag
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- G Identification number (this paper)
6- 8 A3 --- VName Sandage designation, VNN ([S71b] VNN in Simbad)
10- 14 I5 --- OGLE ? OGLE number ([UWP2001] NNNNN in Simbad)
16- 21 F6.3 mag Vmag ? V magnitude
23- 27 F5.3 mag V-I ? V-I colour index
29- 38 A10 --- GCVS GCVS name and Class, VNNNN
(I1613 VNNNN in GCVS)
40- 51 A12 --- SpType Spectral type
53- 57 I5 --- Sibbons ? Sibbons number (2015, Cat. J/A+A/573/A84)
59- 72 A14 --- Other Other names and/or period
74- 78 A5 --- Refs Reference (1)
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Note (1): References as follows:
1 = period from Antonello et al. (1999A&A...349...55A 1999A&A...349...55A)
2 = Sp type from Humphreys (1980ApJ...238...65H 1980ApJ...238...65H)
3 = Britavsky et al. (2014, Cat. J/A+A/562/A75)
4 = Mantegazza et al. (2001, Cat. J/A+A/367/759)
5 = see the text
6 = Herrero et al. (2010, Cat. J/A+A/513/A21)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- G Identitication number (this paper)
6- 13 F8.5 deg RAdeg Right ascension (J2000)
15- 21 F7.5 deg DEdeg Declination (J2000)
23- 25 I3 d Per Period
27- 32 F6.3 mag Jmag J magnitude
33- 38 F6.3 mag Hmag H magnitude
39- 44 F6.3 mag Ksmag Ks magnitude
45- 49 F5.3 mag J-Ks J-Ks colour index
50- 54 F5.3 mag e_Jmag rms uncertainty on Jmag
55- 59 F5.3 mag e_Hmag rms uncertainty on Hmag
60- 64 F5.3 mag e_Ksmag rms uncertainty on Ksmag
65- 70 F6.3 mag Mbol Bolometric magnitude
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- G Identification number (this paper)
6- 7 I2 h RAh Right ascension (J2000) from Sibbons+ 2015
9- 10 I2 min RAm Right ascension (J2000) from Sibbons+ 2015
12- 17 F6.3 s RAs Right ascension (J2000) from Sibbons+ 2015
19 A1 --- DE- Declination sing (J2000) from Sibbons+ 2015
20- 21 I2 deg DEd Declination (J2000) from Sibbons+ 2015
23- 24 I2 arcmin DEm Declination (J2000) from Sibbons+ 2015
26- 30 F5.2 arcsec DEs Declination (J2000) from Sibbons+ 2015
32- 38 A7 --- Sibbons Sibbons (2015, Cat. J/A+A/573/A84)
identification number + type
40- 45 A6 --- [ADK2000] Albert et al. (2000, Cat. J/AJ/119/2780)
identification number + type
47- 51 I5 --- OGLEII OGLE II identification number
53- 58 F6.3 mag Imag I magnitude
60- 64 F5.3 mag V-I ? V-I colour index
66- 78 A13 --- Sp/Var Spectral type or to the variable name
80- 87 A8 --- Ref References (1)
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Note (1): References as follows:
1 = Sandage (1971ApJ...166...13S 1971ApJ...166...13S)
2 = Antonello et al. (1999A&A...349...55A 1999A&A...349...55A)
3 = Kurtev et al. (2001A&A...378..449K 2001A&A...378..449K)
4 = Bernard et al. (2010, Cat. J/ApJ/712/1259)
GCVS = GCVS catalog, B/gcvs
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- G Identitication number (this paper)
5 A1 --- n_G [a] Note (1)
7- 14 F8.5 deg RAdeg Right ascension (J2000)
16- 22 F7.5 deg DEdeg Declination (J2000)
24- 26 I3 d Per Period
28- 33 F6.3 mag Jmag J magnitude
34- 39 F6.3 mag Hmag H magnitude
40- 45 F6.3 mag Ksmag Ks magnitude
46- 50 F5.3 mag J-Ks J-Ks colour index
51- 55 F5.3 mag e_Jmag rms uncertainty on Jmag
56- 60 F5.3 mag e_Hmag rms uncertainty on Hmag
61- 65 F5.3 mag e_Ksmag rms uncertainty on Ksmag
66- 71 F6.3 mag Mbol Bolometric magnitude
73- 79 A7 --- Sibbons Sibbons (2015, Cat. J/A+A/573/A84)
identification number + type
81- 86 A6 --- [ADK2000] Albert et al. (2000, Cat. J/AJ/119/2780)
identification number + type
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Note (1): a: There are two entries for G3083 with different periods as
discussed in Section 8.
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- G Identitication number (this paper)
6- 13 F8.5 deg RAdeg Right ascension (J2000)
15- 21 F7.5 deg DEdeg Declination (J2000)
23- 27 F5.2 mag Jmag J magnitude
29- 33 F5.2 mag Hmag H magnitude
35- 39 F5.2 mag Ksmag Ks magnitude
41- 44 F4.2 mag e_Ksmag rms uncertainty on Ksmag
46- 52 A7 --- Sibbons Sibbons et al. (2015, Cat. J/A+A/573/A84)
identification number + type
54- 59 A6 --- [ADK2000] Albert et al. (2000, Cat. J/AJ/119/2780)
identification number + type
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Sibbons Sibbons (2015, Cat. J/A+A/573/A84)
identification number
7- 15 F9.6 deg RAdeg Right ascension (J2000)
17- 24 F8.6 deg DEdeg Declination (J20000
26- 31 F6.3 mag Jmag 2MASS J magnitude
33- 38 F6.3 mag Hmag 2MASS H magnitude
40- 45 F6.3 mag Ksmag 2MASS Ks magnitude
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 14-Jan-2016